VIVOTEK
22 - User's Manual
GND
+3.3V
DI+
DO-
External
power source
VDC
Switch
BJT transistor
Relay
AC
Source
NO NC
External
device
not used
GND
+3.3V
DI+
DO-
VDC
Switch
BJT transistor
Relay
AC
Source
NO NC
External
device
1. The DO+ pin (3.3V) provides 3.3V±10% output voltages, and the max. load is 50mA.
2. The max. voltage for the DO- pins is 80VDC (External power).
In order to control AC devices, the above diagram can be taken in consideration. The diagram
uses a relay to control the ON/OFF condition of the AC device.
3. An external relay can be triggered by using DO+ or by an external power source, depending
on the type of relay you use.
4. In case of using an individual relay (instead of using a relay module), for protection against
voltage or current spikes, a transient voltage suppression diode must be connected in parallel
with the inductive load.
DI/DO Diagram
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